To write your own sports sensor ECG validation paper: Condition: Seller refurbished; Price: $ 6,990; available on ebay: https://www.ebay.com/itm/223943491845 used and tested by the group of Cardiologist Milind Y. Desai from Cleveland Clinic Ohio in his sports sensor accuracy validation papers: [90.8.3]: Variable Accuracy of Wearable Heart Rate Monitors during Aerobic Exercise https://journals.lww.com/acsm-msse/Fulltext/2017/08000/Variable_Accuracy_of_Wearable_Heart_Rate_Monitors.22.aspx [90.8.5]: Accuracy …